<html>
<head>
	<meta charset="UTF-8">
	<meta content="IE=edge" http-equiv="X-UA-Compatible">
	<meta content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no, width=device-width" name="viewport">
	<title>4219：跑得比谁都快</title>
	<!-- css -->
	<link href="../css/base.min.css" rel="stylesheet">
	<link href="../css/project.min.css" rel="stylesheet">
	
	<!-- favicon -->
	<!-- ... -->
</head>
<body class="page-brand">
	<header class="header header-transparent header-waterfall ui-header">
		<ul class="nav nav-list pull-left">
			<li>
				<a data-toggle="menu" href="#menu">
					<span class="icon icon-lg">menu</span>
				</a>
			</li>
		</ul>
		<a class="header-logo header-affix-hide margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">跑得比谁都快</a>
		<span class="header-logo header-affix margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">跑得比谁都快</span>
	</header>
	<nav aria-hidden="true" class="menu" id="menu" tabindex="-1">
		<div class="menu-scroll">
			<div class="menu-content">
				<a class="menu-logo" href="../index.html">BZOJ离线题库</a>
				<ul class="nav">
					<li>
						<a class="waves-attach" data-toggle="collapse" href="#problems">题目</a>
						<ul class="menu-collapse collapse in" id="problems">
							<li>
								<a class="waves-attach" href="../index.html">主页</a>
							</li>
							<li>
								<a class="waves-attach" href="../list.html">题目列表</a>
							</li>
						</ul>
					</li>
					<li>
						<a class="collapsed waves-attach" data-toggle="collapse" href="#about">关于</a>
						<ul class="menu-collapse collapse" id="about">
							<li>
								<a class="waves-attach" href="../about.html">关于此项目</a>
							</li>
						</ul>
					</li>
					
				</ul>
			</div>
		</div>
	</nav>
	<main class="content">
		<div class="content-header ui-content-header">
			<div class="container">
				<h1 class="content-heading">
                跑得比谁都快                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：233MB</p>			</div>
		</div>
		<div class="container">
			<section class="content-inner margin-top-no">
				<div class="row">
					<div class="col-lg-13 col-md-13">
						<div class="card margin-bottom-no">
							<div class="card-main">
								<div class="card-inner">
									
                                <h3>题目描述</h3><p><div>n+e又即将踏上拯救妹子的道路&hellip;&hellip;</div>
<div>这次的拯救目标是&mdash;&mdash;爱和正义的小叶妹子。</div>
<div>n+e来到boss的洞穴门口，他一下子就懵了，因为面前不只是一只boss，而是上万只boss。当n+e意识到自己还是等级1的时候，他明白这就是一个不可能完成的任务。</div>
<div>但他不死心，他可是跑得比谁都快，他在想，能不能避开boss去拯救妹子呢？</div>
<div>Boss的洞穴可以看成一个矩形，n+e在左下角（0,0），妹子在右上角（A,B）。n+e为了避开boss，当然是离boss距离越远越好了，所以n+e决定找一条路径使到距离boss的最短距离最远。</div>
<div>Ps:n+e走的方向是任意的。</div>
<div>你可以帮帮他吗？</div>
<div>当n+e找到了美丽漂亮的小叶妹子，立刻就被boss包围了！！！n+e缓闭双眼，举手轻挥，白光一闪后使用了回城卷轴，回到了城堡，但只有小叶妹子回去了&hellip;&hellip;因为n+e忘了进入回城的法阵了。（然而并没有什么关系，他可是跑得比谁都快呢）</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行，输入三个数N,A,B，N表示boss的数目，A，B表示矩形的大小；</div>
<div>接下来n行，每行两个数表示boss的位置坐标(x,y)，保证0&lt;=x&lt;=A,0&lt;=y&lt;=B，并且坐标两两不同。</div>
<p></p></p><hr/><h3>输出格式</h3><p><div>输出一个小数，表示n+e的路径离boss的最远距离，精确到小数点后六位。</div>
<p></p></p><hr/><h3>样例输入</h3><pre>#1
2 10 10
5 4
2 1

#2
2 10.000000 10.000000
2.500000 7.500000
7.500000 2.500000</pre><hr/><h3>样例输出</h3><pre>#1
2.000000

#2
3.535534
</pre><hr/><h3>提示</h3><p><p>N&lt;=100000，A,B&lt;=200000</p>
<p></p></p><hr/><h3>题目来源</h3><p>By wjy1998</p>
								</div>
							</div>
						</div>
					</div>
				</div>
				
				
			</section>
		</div>
	</main>

	<div class="fbtn-container">
		<div class="fbtn-inner">
			<a class="fbtn fbtn-lg fbtn-brand-accent waves-attach waves-circle waves-light waves-effect" data-toggle="dropdown" aria-expanded="true"><span class="fbtn-text fbtn-text-left">Menu</span><span class="fbtn-ori icon">apps</span><span class="fbtn-sub icon">close</span></a>
			<div class="fbtn-dropup">
				<a class="fbtn fbtn-brand waves-attach waves-circle waves-light waves-effect" href="../list.html" target="_self"><span class="fbtn-text fbtn-text-left">题目列表</span><span class="icon">menu</span></a>
				<a class="fbtn fbtn-green waves-attach waves-circle waves-effect" href="../index.html" target="_self"><span class="fbtn-text fbtn-text-left">返回主页</span><span class="icon">home</span></a>
				<a class="fbtn waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/submitpage.php?id=4219" target="_blank"><span class="fbtn-text fbtn-text-left">提交代码</span><span class="icon">send</span></a>
				<a class="fbtn fbtn-orange waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/wttl/wttl.php?pid=4219" target="_blank"><span class="fbtn-text fbtn-text-left">试题讨论</span><span class="icon">chat</span></a>
				
			</div>
		</div>
	</div>

	<!-- js -->
	<script src="../js/jquery.min.js"></script>
	<script src="../js/base.min.js"></script>
	<script src="../js/project.min.js"></script>
</body>
</html>